Safe, healthy and happy Thanksgiving
Grape seeds, stems and skins can reduce dairy cattle emissions
Low-cost wine industry additive also improved feed efficiency and milk quality
Researchers at University of California, Davis, added fresh grape pomace left over from winemaking operations to alfalfa-based feed for dairy cows and found that methane emissions were reduced by 10% to 11%.
The preliminary findings could offer a low-cost sustainable pathway for vineyards to reduce waste while helping dairy operations maintain quality while cutting back on emissions of methane, which is a powerful greenhouse gas.
“This is the first time anybody has shown that this can work in California,” said Ermias Kebreab, an animal science professor and associate dean of global engagement at UC Davis. “You're reducing emissions, you're improving the quality and it may also reduce the cost of production.”
The pilot research project, which will be detailed in a paper later this year, also found that mixing in grape pomace improved feed efficiency and increased healthful fats, said Selina Wang, an associate professor of Cooperative Extension in small scale fruit and vegetable processing.
“We found that the feed with the additive of grape pomace changed the fatty acid composition of the milk and, in particular, increased the polyunsaturated fats, which are the main fats in grape pomace,” Wang said. “This suggests that supplementing the feed with an optimal fatty acid profile may have positive impact on the fatty acid profile of the milk and increase their health benefits.”
Symbiotic commodities?
In 2022, California was the leading dairy producer in the country, generating $10.40 billion in sales, while 90% of wine production came from the Golden State, with a market value of $5.54 billion.
Processing grapes for wine generates thousands of tons of waste in the form of grape pomace, which consists of leftover seeds, skins and stems. Dairy and livestock are responsible for more than half of the state's methane emissions, owed largely to cow burps.
They are the top two agricultural commodities in California, according to state production statistics, and reducing waste and emissions for both industries are key to the state meeting its climate goals.
Tannins for emission reductions
Wine grapes are high in fats and tannin, which is known to reduce methane emissions, so Kebreab sought to test if adding grape pomace to feed could have a positive effect while not adversely affecting production.
“It's a byproduct that's not being used much,” he said. “This is something that can be included in our efforts to try to reduce emissions.”
A mix of feed options
To do the research, scientists worked with Holstein dairy cows and gave the animals feed consisting of alfalfa, wheat, almond hulls, cottonseed and grain. After two weeks, the cows were split into three groups: A control group with no change in diet, another where the feed combination included 10% grape pomace and a third that received 15% grape pomace.
Every four weeks, the cow groups would change feed combinations.
They were fed twice daily by postdoctoral students and interns, and emissions were monitored daily. Milk production was documented in the morning and evening and milk samples were collected weekly to analyze for fat, protein, lactose and other measurements, which showed no differences between the control and other groups.
Methane and hydrogen emissions were reduced compared with the control group, suggesting that grape pomace reduced enteric emissions without affecting production.
“I think the dairy industry will be very interested in this,” Kebreab said. “Sometimes when you're using additives, they have palatability issues. With grape pomace, they absolutely love it.”
Next on the list is a trial with olive pomace and working to understand the mechanism that reduces emissions. “If we have a better understanding of the mechanisms, we can select the feed additive or a mix of feed additives to reduce dairy cattle emissions and make dairy milk healthier while making use of the agriculture byproducts,” Wang said. “There's a lot of room to grow in this space and we're excited about this work.”
The research was supported by the California Dairy Research Foundation.
This article was first published on the UC Davis news site.
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UC Cooperative Extension increases food security, reduces food waste in San Bernardino County
From August 2023 to March 2024, UC Cooperative Extension in San Bernardino County provided interactive classes and demonstrations in English and Spanish for ethnically diverse and limited-resource residents that led to increased food security and reduced food waste.
These efforts were funded by the UC Sustainable Agriculture Research and Education Program Small Grants Program, which supports the development of sustainable community food systems.
Workshops draw on experts from variety of UC ANR programs
The project in San Bernardino County, led by Christine Davidson of UCCE and the Expanded Food Nutrition Education Program, mobilized a team of EFNEP, UC Master Gardener Program and UC Master Food Preserver Program staff and volunteers to educate families in underserved communities through a series of hands-on workshops.
Thirty-six mothers attended EFNEP lessons from the “Eating Smart, Being Active” curriculum focusing on improving knowledge and skills in the areas of diet quality, food resource management, food safety, physical activity and food security.
They also attended Master Gardener workshops to learn how to grow vegetables in their home gardens and compost food waste, and Master Food Preserver classes where they made healthy recipes and learned about safe food preservation with a focus on food waste prevention.
Two hundred and twenty children at two schools attended a series of EFNEP lessons and a workshop to learn about composting with worms or composting in a jar. “The students love the hands-on activities, and with this knowledge they can participate in composting food waste at home,” said Davidson. “It was especially rewarding to teach the kindergarteners about composting since it was a new concept for them.”
The SAREP grant provided funding for kits and materials that parents and children took home to apply their new knowledge in making different salads, using scraps to make vegetable broth, growing herb gardens and composting at home. “The kits are great incentives for people to attend the classes and reinforce their learning at home,” Davidson noted.
With better meal planning and proper food storage, families can save food and money. “I have begun saving scraps to make vegetable broth that I use to make rice. My kids love collecting the scraps and it saves money buying the broth,” said a parent at Bradley Elementary School in San Bernardino.
Additionally, families are educated on the organic waste reduction requirements of Senate Bill 1383 and how they can do their part to reduce food waste.
The final product of the SAREP-funded project will be a Food Waste Prevention Workshop Toolkit in Spanish and English that will be shared widely and delivered in UC ANR workshops by staff and volunteers in other counties. “Our goal beyond providing these materials to support our community is to help grow their use across UC ANR so more families can benefit from them,” said Davidson.
Small grants, big impacts
Funding priorities for the Small Grants Program include supporting California farmers, ranchers and land stewards in the adoption of environmentally regenerative practices and partnering with rural, urban and tribal communities to expand access to healthy, sustainably produced food and promote community well-being.
“The Small Grants Program is an important part of our mission,” said Ruth Dahlquist-Willard, interim director of UC SAREP, a program of UC Agriculture and Natural Resources. “Program outcomes show that a small financial investment can have a large impact in improving the lives of Californians.”
This article is part of a series on the impact of the UC SAREP Small Grants Program. To support this program, please donate here. Choose SAREP Small Grants Program for the designation.
Compost2 EFNEP
AI and sustainable farming focus of May 7 workshop with UC, partners
On May 7, scientists from University of California, Riverside, UC Agriculture and Natural Resources, Colorado State University Extension, Kansas State University, University of Arizona, Central Arizona Project, and USDA-Agricultural Research Service will gather with growers in Palm Desert to discuss how artificial intelligence can be used in agriculture.
“Artificial intelligence can be used by farmers to save water, improve fertilizer efficiency and increase productivity,” said Khaled Bali, UC Cooperative Extension irrigation water management specialist and organizer of the workshop. “At this workshop, growers will hear about the latest research on AI technology for agriculture and about the experiences of growers who are already testing it in their fields.”
Speakers and topics will include:
- Raj Khosla, Kansas State University - AI for precision nitrogen and water management in row crops
- Michael Cahn, UC Cooperative Extension - CropManage decision support tool for irrigation and nutrient management
- Daniele Zaccaria, UC Cooperative Extension - Citrus crop water use and open ET in the low desert of California
- Nan Li, UC Riverside - Estimating soil moisture using remote-sensing and land surface parameters in the Central Valley of California.
- Ali Montazar, UC Cooperative Extension - Promises and pitfalls of drip irrigation in desert cropping systems
- Khaled Bali, UC Cooperative Extension - Deficit irrigation strategies for alfalfa in California
- Philip Waisen, UC Cooperative Extension - Environmentally conscious practices for managing soilborne diseases in low desert vegetable production
- Peter Moller, Rubicon Water - On-farm water conservation projects: surface irrigation
- Ronnie Leimgruber, Imperial Valley grower - On-farm water conservation projects: linear move, basin and subsurface drip irrigation
- Rick Benson, Imperial Valley grower - Alternative cropping systems for the low desert region of California: olives and other crops
The workshop will be held at the UCR Palm Desert Center at 75080 Frank Sinatra Drive in Palm Desertfrom 8 a.m. to 3 p.m. on May 7. It costs $30 per person and includes lunch. Register at https://bit.ly/AImay7.
Young orchard water and nutrient management workshops offered in Modesto, Merced, Fresno, Bakersfield
Growers invited to discuss young almonds, pistachios, walnuts, olives and citrus orchards starting May 9
To help growers manage irrigation and nutrients for young and immature orchards, UC Cooperative Extension is offering workshops in Modesto, Merced, Fresno and Bakersfield.
The workshops will feature presentations by various experts and researchers focusing on best irrigation and nutrient management practices tailored specifically for young orchards in the San Joaquin Valley. They will cover almonds, pistachios, walnuts, olives and citrus.
“Attendees will gain insights into the irrigation and nutrient needs of young orchards, which are different from those applicable to mature orchards, and learn strategies for adjusting these practices as orchards mature,” said Moneim Mohamed, UC Cooperative Extension irrigation and soils advisor for Stanislaus, San Joaquin and Merced counties. “This knowledge aims to ensure healthier tree development, better resource use and more resilient orchards in the face of climate change.”
Growers, certified crop advisers and other agricultural professionals are encouraged to attend. Workshop attendees may request one-on-one assistance from a UCCE farm advisor.
Speakers include UCCE advisors Mohamed, Mae Culumber, Tobias Oker, and Cameron Zuber, UCCE specialist Giulia Marino, Andre Daccache of UC Davis, Charles Hillyer and Shawn Ashkan of Fresno State.
The Young Orchard Irrigation and Nutrient Management workshops will be held in four locations:
May 9 (8 a.m.–12:30 p.m.)
UC Cooperative Extension, Room HI, 3800 Cornucopia Way
Register at https://ucanr.edu/orchardsmodesto
Merced
May 14 (8 a.m.–12:30 p.m.)
UC Cooperative Extension, 2145 Wardrobe Avenue
Register at https://ucanr.edu/orcharsmerced
Fresno
May 22 (8 a.m.–12:30 p.m.)
Fresno State, 5370 N. Chestnut M/S OF 18
Register at https://ucanr.edu/orchardsfresno
Bakersfield
June 5 (8 a.m.–12:30 p.m.)
UC Cooperative Extension, 1031 South Mount Vernon Avenue
Register at https://ucanr.edu/orchardsbakersfield
Workshops are free and include coffee breaks, lunch, workshop materials along with the presentations. Registration is required.
These workshops are supported by a grant from California Department of Food and Agriculture and sponsored by Almond Board of California, California Pistachio Research Board, WiseConn Engineering and Irrometer Company, Inc.
UC ANR offers scholarships for agriculture students, May 13 deadline
Applications and nominations of outstanding students pursuing careers in agriculture will be accepted through May 13, 2024, for UC Agriculture and Natural Resources scholarships and awards.
Students, faculty and colleagues are encouraged to take advantage of these opportunities to honor academic excellence and provide additional support for undergraduate and graduate students.
Bill and Jane Fischer Vegetation Management Scholarshipis for students enrolled at ANY accredited California university, with preference given to graduate students. The recipient of the $1,000 (multiple awards possible) will be selected from students who are enrolled in fall 2024 pursuing degrees in vegetation management, weed science or agriculture specializations plant science, soils and plant nutrition, agricultural engineering, agricultural botany, plant pathology, plant protection and pest management, or agricultural economics. Students apply directly.
Howard Walton Clark Prize in Plant Breeding and Soil Buildingis for students enrolled at UC Berkeley, UC Davis or UC Riverside. The $5,000 (multiple awards possible) will be awarded to a promising student who will be enrolled as a senior in fall 2024 in the College of Agriculture and/or Natural Resources with demonstrated scholastic achievement and talent for independent research with reference to either plant breeding (leading to new/improved crops and new/improved varieties using appropriate tools) or soil building (leading to improving soil quality related to soil productivity and sustainability as a resource). Nomination by faculty member required.
Knowles A. Ryerson Award in Agricultureis for students enrolled at UC Berkeley and UC Davis. $2,500 (minimum one award for each campus)given to an international undergraduate student who will be enrolled in fall 2024 in the College of Agriculture and/or Natural Resources, in any curriculum, preferably after completion of the junior year. The award is based on high scholarship, outstanding character and promise of leadership. Nomination by faculty member required.
More information about the application process can be found on at https://ucanr.edu/anrscholarships.
For questions, please contact Andrea Ambrose, UC ANR director of advancement, at apambrose@ucanr.edu.